As with most clinical situations with limited data, individualized decision making is key. Based on small series I do not generally offer RT post mastectomy for DCIS if it is close. If it is clearly involved after reviewing with the pathologist, I would discuss with the surgeon and patient and ...

I agree with @Bruce G. Haffty that I would not for a "close" margin.  The few times I've encountered an actual positive margin, it's usually a patient status-post skin-sparing mastectomy and immediate TE-based reconstruction, and they've got no idea where the "anterior" positive margin wou...

The recent retrospective data suggest risk of recurrence is low for patients with DCIS and close margin at mastectomy and we would recommend observationhttps://www.ncbi.nlm.nih.gov/pubmed/22975615http://www.ncbi.nlm.nih.gov/pubmed/20646871

Based on a study reported by Rita Abi-Raad, et al on Int J Radiat Oncol Biol Phys, 2011. For women with breast cancer women following mastectomy and the patient has three or more risk factors, the total LRR rate at 10 years is 19.7%. The risk factors are: positive LVI, close or positive margin ...